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Currently I am using:
Front - 155/60/R15
Rear - 175/55/R15
When I search for new tyres I also see compatible:
Front - 175/55/R15
Rear - 195/50/R15
Any suggestions on which tyre size would fit correctly and provide a thick enough sidewall to make the ride more comfortable?

The 2nd figure (55 and 50) means a narrower sidewall on the compatible's in comparison to the current tyres.... so you're making the ride (ever so slightly) harder with the compatible's. (The lower the 2nd figure, the narrower the sidewall, so the harder the ride.)

Currently my CDI (10Plate) doesn't feel very smooth at all. I feel every bump in the road.

As Claire says , if you wanted a smooth ride , the smart isn't one of them...

You may want to try slightly lower tyre pressures, what are you running with at the moment re pressures ?

Last edited by reinaldo_is_spam; 19-02-2016 at 07:34 PM.
Reason: Lower not slower

The 2nd figure (55 and 50) means a narrower sidewall on the compatible's in comparison to the current tyres.... so you're making the ride (ever so slightly) harder with the compatible's. (The lower the 2nd figure, the narrower the sidewall, so the harder the ride.)

As Claire says , if you wanted a smooth ride , the smart isn't one of them...

You may want to try slightly lower tyre pressures, what are you running with at the moment re pressures ?

Not entirely accurate, the second figure is the percentage of the 1st figure which gives you the side wall size. So these tyres would have a slightly thicker sidewall.

Not entirely accurate, the second figure is the percentage of the 1st figure which gives you the side wall size. So these tyres would have a slightly thicker sidewall.

You're right of course, I should have qualified my example with tyres of equal width....

In this particular case the sidewall height is a full 1.25mm taller on the rears (not exactly 'thicker' walls though in tge strictest sense of the word, but deeper sidewalls, i.e. More black showing on a side view ) and a whole 3.25mm taller on the fronts

You're right of course, I should have qualified my example with tyres of equal width....

In this particular case the sidewall height is a full 1.25mm taller on the rears (not exactly 'thicker' walls though in tge strictest sense of the word, but deeper sidewalls, i.e. More black showing on a side view ) and a whole 3.25mm taller on the fronts

Exactly! This is my point, there is not much difference at all, so I was hoping someone could tell me if there is another compatible set which allows for a 'deeper' sidewall?

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